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5 Written questions

5 Matching questions

  1. what is a machine?
  2. what is a screw?
  3. What are compound machines?
  4. ^ ^ Doing work?
  5. if you throw a ball, are you doing work? Explain.
  1. a a device that helps make work easier by changing the size or direction of a force.
  2. b you are only doing work on the ball as long as you are directly putting a force on it, in other words, when you are touching it.
  3. c a inclined plane that is wrapped in a spiral, usually on a rod, but not always.
  4. d Yes
  5. e a machine made of two or more simple machines. example: scissors, can openers

5 Multiple choice questions

  1. a simple machine that is made of a circular object connected to a rod.
  2. is a measure of how much of a machines energy is wasted, overcoming friction. No machine is 100% efficient, becuase there are always surfaces rubbing together.
  3. pushing a piece of heavy furniture up a ramp requires less input force, from you, than just lifting it up.
  4. turn a door knob (the wheel) the axle moves, to unfasten the door.
  5. W= F x D, the unit Joule

5 True/False questions

  1. What two things do we need to know to calculate work?we need to know the size of the force that was put on the object, and how far the object moved.

          

  2. ^ ---> Doing work?Yes

          

  3. What is the fulcrum of a lever?P=W / T, the unit Watts

          

  4. ^ <--- Doing work?Yes

          

  5. What is the scientific meaning of the word "work"?P=W / T, the unit Watts